Baja Motorsports Replacement Part Product Specs: Clutch assembly (#17) is replacement clutch for 49cc 2-stroke Chinese manufactured brands and models. Popular in Taiwan manufactured mopeds & scooters. Clutch details:16 splines inside the clutch drum/bell 12mm ID on bell at splines 6901 bearing in clutch shoe plate OD of bell housing: 119mm [4.7″] ID of bell housing: 112mm [4.4″] Three shoes Pulley OD: 115mm [4.5″] Pulley ID: 17mm [.669″] Width of pulley: 25mm [.97″] on outside BKM172514U-1 bearing in pulley Fits Taiwan 49cc 2-stroke engines Compatible with SC50 50cc Baja Scooter Baja Part Number & Description: SC50-328; ClutchAssembly Known to fit scooters with the 50cc 2-stroke 1PE40QMB or 90cc 2-stroke 1PE50QMF Minarelli based engine used by Adly, Aeon, Aprilia, Atala, Benelli, Beta, BKM, BSV, CPI, Dinli, Eton, Fly, Geely, , Italjet, Kasea, Keeway, Kreidler, KTM, Kymco, Linhai, Malaguti, MBK, Minarelli, Motron, MZ, PGO, Polaris, Strada, TNG, Vento, Xtrem and Yamaha.